Simon Willnauer 6f82b0c6e2 Allow ClusterState.Custom to be created on initial cluster states (#26144)
Today we have a `null` invariant on all `ClusterState.Custom`. This makes
several code paths complicated and requires complex state handling in some cases.
This change allows to register a custom supplier that is used to initialize the
initial clusterstate with these transient customs.
2017-08-11 09:51:49 +02:00
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